Canada



May 3, 1927. l 1,626,751

l., PARR v uAcxuNE Fon ST'RAIGHTENING sus Filed April 1o. 1925 "MII . m l If n N cegf.

lt//fneae l I New 4/ WM :15%

Patented Mayyf3,

UNIT Elf",Y STATES lLotus- PAR'R, orfvaNooUvEE BRITISH Yo"oLui/nain,'camm'rim.

MACHINE Fon s'rRAierrrnNiive/saws.

` Application'inedAprii-io, ieasjfseriai naiss.y 9

This invention relates to a method and machine for straightening'saws and more ,particularly circular sawy blades.

`An importa-nt obj ectfof the invention isy to providezan yimproved method of straightening saws. H f

v- A further object of the invention is; to

provide an improved vmethod''whereby .the blades of saws may be straightened quickly and efficiently.l n rf f v Anotherohfect of the invention is to prof vide rany "improved'meth'od whereby 'saw blades may be efficiently greatsaving ,in cost.

ride means' for heatiiigfand actuating a: savvto .straighteny the blade thereof@ 2 @Another objectofthe inventionitto provide mechanism lfor engaging, actuating and heating the lblade so 'as to `quickly and 'effi- Acientlystraightenthefblade thereof,VL

Other objects and advantages krofthis'ykinyvention will become va'ppareiitcas jthede?y scriptionprogresses; i n y l 1 lnv ythe accompanying drawing forming a part l"of thisk specification andinwhichlike numerals are employed `to designate corra spending parts throughout the saine:

.`Figure 1 is an elevational view showinga saw ymounted in 'association with mechanism' preferably n einployedrwith `myjimproved method and machine',l andy i Figure k2 is an enlarged vertical sectional view talen through the. shaft retaining member.

1n the drawing7 wherein for'tliepurpose lof illustration `is shownthe preferred type y of mechanism used inypr'act-icing the present v-ineth od,A 4the Vnui'neral 5' n generally designates ya longitudinal horizontally extending shaft ywhich isrotatably mounted upony suitable bearings. `Thejremote extremities of the shaft are supported uponend bearing blocks 6 antl'each of thesey blocks being provided with journalboiies 8`upon the upperside adjacent the inner edge.' block Gisvprovided fon lthefoutermost edge thereof. withL a thrustfblock y9 adapted to rotatably support rvthe shaft and prevent arial increment-thereofr'* Tl'ie'opposite end bearing block 7 carries substantially long bearing or boinlO ,y provided with a suitable bore Atli'erethioughiinternally screw threaded,

e the purpose of which will kbe hereinafter lmore fully described.v v v,

The rotatable shaft 5 is formed of two straightened at a rnother object of theinvention to protact thereof; y

yobvious that tlie'screw 18 may be rotated The `end `bearing Vcomplenientary sections 11"* and 12 rotatably supported adjacent their inner contacting ends by means of intermediate bearing blocks lcarrying suitable vjournal boxes 14 for YQltlbly v"supporting the shaft Asections in d1gninent One ofthe shaft section's12 car` ries "aibearing collar 15;y this collar together with @the thrust block retaining the shaft section 12 securely against axial *movement Thisv section alsocarries a pulley 16 'by means of whichthe shaftconstruction'is rotated, this-fpulley" being adapted `to receive thereon sir'ablesoui'cefof power. j n

'lfh'foregoing elements While`` individually of conventional desigi'iLA are arranged toy be especially'useful in my saw straightening method. My improved'inethodand machine embody additional mechanism ofnovel con*k struction inthe accomplishment. thereof, this construct-ion rincluding thefrotatable shaft if suitable'drive belt connected withl any deigection-11 whichl is adjustably'mounted' relative' tothe section 12. yThisfadjustment-is' securedbyan extensionof theshaft 11v subf stantially vinto the journal box `10, approximately one-halfthe length thereof.' Thread edly mounted in t-heopposite portion ofthe journal box 10 is a threadedy adjusting screwr 17;?. provided on; the outer extremity with'a suitable operating crank 18 for operation thereof;y 'It' is desirable'thata suitable thrustl bearing 19 be interposed betweeny the adjacent ends of theadjustingscrew 17and the shaftsection 11 to reduce theffrictional con- From this construction it is and thereby adjust' the' axial position of the shaft section 11forcing this section against or away from the complementary section k12.

f jThe adjacent extremities of the shaft seci rtionsgll and v12'are' provided with a pair yCio-acting 'annular `flanges 2O formed inltegral withtheshaft construction or secured Y .thereon inany suitable manner.

n n .y n The shaft sections 11 and 12 yare retained in alignment during" operative engagement "by aligning formed "in" the inner vextremity 7 of the 'secmechanislmincluding a cylindrical shaft pin 21`slidbly llilo'unted ina longitudinal 'bore'.

while the y otherfendcarries a reducedfextensionff23. Aj The intermediate portion of the cylindrical shaft pin 21 is `provided with a vlongitudinal slot 24 engageable with a secured to the shaft section, the pin being adapted to limit longitudinal movement of the shaft pin 21. The frusto-conical eXtension 22 is engageable with a tapered recess 2G formed in the end of the section 11, the recess being so formed as to snugly receive the extension 22. In order that the shaft pin 21 may be firmly forced in an outx rardly projected position a suitable compression spring 27 is mounted in engagement with the reduced extension 23 and the inner extremity of the shaft bore 21. When the shaft sections 11 and 12 are in separated positions the shaft pin 21 is forced to its outermost position by means of the compression spring 27, this movement being limited by means of the guide pin 25. To bringthe shaft sections in contact for operation, the handle crank 18 is rotated causing the screwl shaft 17 to force the shaft section 11 axially through its bearings and against the section 12, the recess 26 formed in the end of the section 11 engaging the frusto-conicalextension 22 upon the shaft L pin 21 and forcing the pin partially within the bore 2,1.

It is desirable in the application of my improved method to provide vsuitable heating means, in this instance, including a pair of oppositely-disposed burners 28 comprising gas burners connected on the eXtremities with suitable supply pipes 29. These heating burners and pipes are connected through suitable retaining means formed in the intermediate bearing blocks 13, being mounted therein in any suitable manner and preferably adjustable radially from the central axis of the shaft 5.

In operation, a saw designated by the numeral 30 is mounted between the shaft sections 11 and 12, this being accomplished by moving the section 11 sufficiently away from the section 12 to permit the saw blade being` inserted therebetween, the central aperture of the saw being then positioned over the tapered projection of the shaft pin 21. The shaft 11 is then moved into contact with the saw by rotating the adjusting screw 11 and forcing the section 11 upon the shaft pin 21, as previously described. It is apparent from the foregoing that the saw will be firmly held between the inner extremities of the shaft sections and the shaft is4 then rotated at a relatively high speed. The burners 28 are ignited and the heat directed upon `,the blade. It is to be noted, of course, that various heating means may be employed and the vdevice is not restricted to this particular form of heating element. c,

The high speed revolution of the shaft 5 and application of heat to the saw blade, will, by centrifugal force cause the heated material to iiow in alignment and straighten the saw blade in comparatively short time. It is obvious that this operation will not only perform the function indicated but do so at a great saving of time and labor and materially reduce the cost of manufacture of these saws.

It is to be understood that various changes may be made in the above outlined method and in the machine construction herein described without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. A device of the character described comprising a shaft formed of two complementary sections, means for rotatably supporting the sections in alignment, a saw engaging member movably mounted in one of the shaft sections engageable with a recess formed in the adjacent sections so as to prevent displacement of a saw, means formed on the adjacent ends of the shaft sections for firmly engaging a saw, and heating means comprising a pair of heat generating members mounted in spa-ced relation adjacent thesaw body arranged to heat the body during its rotation.

2. An apparatus for straightening saws comprising ashaft formed of two complementary aligned sections supported for rotatable movement, means formed on the meeting ends of the shaft sections for detachably securing a saw therebetween, means operatively associated with the outer end of one of the shaft sections for adjustably moving the section adjacent to or away from the complementary section, and heating means comprising a pair of heat generating members supported in position adjacent the saw.

3. In an apparatus for straightening saws, the combination with a sectional shaft, means for longitudinally moving one of the sections relative to the complementary section and heating means supported adjacent the saw blade of saw engaging means including a shaft pin slidable in a longitudinal recess in one of the sections having its outer ends tapered to project in an opening in the saw and engage a recess in the end of the complementary section, and means for resiliently urging the shaft pin into extended operative position.

In testimony whereof I affix my signature.

Louis Paita. 

